* {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;

}

:root {
    --color-primary: #6c63ff;
    --color-success: #00bf8e;
    --color-warning: #f7c94b;;
    --color-danger: #f75842;
    --color-danger-variant: rgba(247, 88, 66, 0.4);
    --color-white: #fff;
    --color-light: rgba(255, 255, 255, 0.7);
    --color-black: #000;
    --color-bg: #1f2641;
    --color-bg1: #2e3267;
    --color-bg2: #424890;

    --container-width-lg: 76%;
    --container-width-md: 90%;
    --container-width-sm: 94%;

    --transition: all 400ms ease;
}

body {
    font-family: 'Montserrat', sans-serif;
    line-height: 1.7;
    color: var(--color-white);
    background: var(--color-bg)
}

.container {
    width: var(--container-width-lg);
    margin: 0 auto;
}

section {
    padding: 6rem 0;
}

section h2 {
    text-align: center;
    margin-bottom: 4rem;
}

h1,
h2,
h3,
h4,
h5 {
    line-height: 1.2;
}

h1 {
    font-size: 2.4rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.6rem;
}

h4 {
    font-size: 1.3rem;
}

a {

    color: var(--color-white);
}

img {
    width: 100%;
    display: block;
    object-fit: cover;
}

.btn {
    display: inline-block;
    background: var(--color-white);
    color: var(--color-black);
    padding: 1rem 2rem;
    border: 1px solid transparent;
    font-weight: 500;
    transition: var(--transition);
    border-radius: 0.7rem;
}

.btn:hover {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-primary {
    background: var(--color-danger);
    color: var(--color-white);
}

/* NAVBAR */

nav {
    background: transparent;
    width: 100vw;
    height: 5rem;
    position: fixed;
    top: 0;
    z-index: 11;
}

/* Change navbar styles on scroll using JS */
.window-scroll {
    background: var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}


.nav__container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav button {
    display: none;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.nav__menu a {
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav__menu a:hover {
    color: var(--color-bg2);
}


/* HEADER */

header {
    position: relative;
    top: 5rem;
    overflow: hidden;
    height: 70vh;
    margin-bottom: 5rem;
}

.header__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 5rem;
    height: 100%;
}

.header__left p {
    margin: 1rem 0 2.4rem;
}


/* Categories */

.categories {
    background: var(--color-bg1);
    height: 32rem;
}

.categories h1 {
    line-height: 1;
    margin-bottom: 3rem;
}

.categories__container {
    display: grid;
    grid-template-columns: 40% 60%;
    /* gap: 4rem; */
}

.categories__left {
    margin-right: 4rem;
}

.categories__left p {
    margin: 1rem 0 3rem;
}

.categories__right {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.category {
    background: var(--color-bg2);
    padding: 2rem;
    border-radius: 2rem;
    transition: var(--transition);
}

.category:hover {
    box-shadow: 0 3rem 3rem rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.category:nth-child(1) .category__icon {
    background: var(--color-warning);
}

.category:nth-child(2) .category__icon {
    background: var(--color-danger);
}

.category:nth-child(3) .category__icon {
    background: var(--color-primary);
}

.category:nth-child(4) .category__icon {
    background: var(--color-success);
}

.category:nth-child(5) .category__icon {
    background: var(--color-warning);
}




.category__icon {
    background: var(--color-primary);
    padding: 0.7rem 0.85rem;
    border-radius: 0.9rem;
}

.category h5 {
    margin: 2rem 0 1rem;
}

.category p {
    font-size: 0.85rem;
}

/* NIVELES */

.courses {
    margin-top: 10rem;
}

.courses__container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.course {
    background: var(--color-bg1);
    text-align: center;
    border: 1px solid transparent;
    transition: var(--transition);
}

.course:hover {
    background: transparent;
    border-color: var(--color-primary);
}

.course__info {
    padding: 2rem;
}

.course__info p {
    margin: 1.2rem 0 2rem;
    font-size: 0.9rem;
}


/* FAQS */

.faqs {
    background: var(--color-bg1);
    box-shadow: inset 0 0 3rem rgba(0, 0, 0, 0.5);
}

.faqs__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.faq {
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.4rem;
    height: fit-content;
    background: var(--color-primary);
    cursor: pointer;
    border-radius: 0.7rem;
    transition: var(--transition);
}

.faq:hover {
    box-shadow: 0 3rem 3rem rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.faq h4 {
    font-size: 1rem;
    line-height: 2.2;
}

.faq__icon {
    align-self: flex-start;
    font-size: 1.2rem;
}

.faq p {
    margin-top: 0.8rem;
    display: none;
}

.faq.open p {
    display: block;
}

/* Testimonios */

.testimonials__container {
    overflow-x: hidden;
    position: relative;
    margin-bottom: 5rem;
}

.testimonial {
    padding-top: 2rem;
}

.avatar {
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    overflow: hidden;
    margin: auto;
    border: 1rem solid var(--color-bg1);
}

.testimonial__info {
    text-align: center;
}

.testimonial__body {
    background: var(--color-primary);
    padding: 2rem;
    margin-top: 3rem;
    position: relative;
    border-radius: 0.7rem;
}

.testimonial__body::before {
    content: "";
    display: block;
    background: linear-gradient(
        135deg,
        transparent,
        var(--color-primary),
        var(--color-primary),
        var(--color-primary));
    width: 3rem;
    height: 3rem;
    position: absolute;
    left: 50%;
    top: -1.5rem;
    transform: rotate(45deg);
}

/* Footer */

footer {
    background: var(--color-bg1);
    padding-top: 5rem;
    font-size: 0.9rem;
}

.footer__container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5rem;
}

.footer__container > div h4 {
    margin-bottom: 1.2rem;
}

.footer__1 p {
    margin: 0 0 2rem;
}

footer ul li {
    margin-bottom: 0.7rem;
}

footer ul li a:hover {
    text-decoration: underline;
}

.footer__socials {
    display: flex;
    gap: 1rem;
    font-size: 1.2rem;
    margin-top: 2rem;
}

.footer__copyright {
    text-align: center;
    margin-top: 4rem;
    padding: 1.2rem 0;
    border-top: 1px solid var(--color-bg2);
}


  /* Tablets MEDIA QUERY */

    @media screen and (max-width: 1024px) {
        .container{
            width: var(--container-width-md);
        }

        h1 {
            font-size: 2.2rem;
        }

        h2 {
            font-size: 1.7rem
        }

        h3 {
            font-size: 1.4rem;
        }

        h4 {
            font-size: 1.2rem;
        }

        /* NAVBAR */

        nav button {
            display: inline-block;
            background: transparent;
            font-size: 1.8rem;
            color: var(--color-white);
            cursor: pointer;
        }

        nav button#close-menu-btn {
            display: none;
        }   

        .nav__menu {
            position: fixed;
            top: 5rem;
            right: 5%;
            height: fit-content;
            width: 18rem;
            flex-direction: column;
            gap: 0;
            display: none;
        }

        .nav__menu li {
            width: 100%;
            height: 5.8rem;
            animation: animateNavItems 400ms linear forwards;
            transform-origin: top right;
            opacity: 0;
        }

        .nav__menu li:nth-child(2) {
            animation-delay: 100ms;
        }

        .nav__menu li:nth-child(3) {
            animation-delay: 250ms;
        }

        .nav__menu li:nth-child(4) {
            animation-delay: 400ms;
        }

        @keyframes animateNavItems {
            0% {
                transform: rotateZ(-90deg) rotateX(90deg) scale(0.1);
            }
            
            100%{
                transform: rotateZ(0) rotateX(0) scale(1);
                opacity: 1;
            }
        }

        .nav__menu li a {
            background: var(--color-primary);
            box-shadow: -4rem 6rem 10rem rgba(0, 0, 0, 0.6);
            width: 100%;
            height: 100%;
            display: grid;
            place-items: center;
        }

        .nav__menu li a:hover {
            background: var(--color-bg2);
            color: var(--color-white);
        }

        /* HEADER */

        header {
            height: 52vh;
            margin-bottom: 4rem;
        }

        .header__container {
            gap: 0;
            padding-bottom: 3rem;
        }

        /* CATEGORIES */

        .categories {
            height: auto;
        }

        .categories__container {
            grid-template-columns: 1fr;
            gap: 3rem;
        }

        .categories__left {
            margin-right: 0;
        }

        /* POPULAR COURSES */

        .courses {
            margin-top: 0;
        }

        .courses__container {
            grid-template-columns: 1fr 1fr;
        }

        /* FAQ */

        .faqs__container {
            grid-template-columns: 1fr;
        }

        .faq {
            padding: 1.5rem;
        }

        /* FOOTER */

        .footer__container {
            grid-template-columns: 1fr 1fr;
        }

    }


    /* PHONE MEDIA QUERY   */

    @media screen and (max-width:600px) {
        .container {
            width: var(--container-width-sm);
        }

        /* NAVBAR */

        .nav__menu {
            right: 3%;
        }

        /* HEADER */

        header {
            height: 100vh;
        }

        .header__container {
            grid-template-columns: 1fr;
            text-align: center;
            margin-top: 0;
        }

        .header__left p {
            margin-bottom: 1.3rem;
        }

        /* CATEGORIES */

        .categories__right {
            grid-template-columns: 1fr 1fr;
            gap: 0.7rem;
        }

        .category {
            padding: 1rem;
            border-radius: 1rem;
        }

        .category__icon {
            margin-top: 4px;
            display: inline-block;
        }

        /* POPULAR COURSES */

        .courses__container {
            grid-template-columns: 1fr;
        }

        /* TESTIMONIALS */

        .testimonial__body {
            padding: 1.2rem;
        }

        /* FOOTER */

        .footer__container {
            grid-template-columns: 1fr;
            text-align: center;
            gap: 2rem;
        }

        .footer__1 p {
            margin: 1rem auto;
        }

        .footer__socials {
            justify-content: center;
        }
    }